sn65dsi83.c: fix dual-channel LVDS output also divide porches
When generating dual-channel LVDS to a single display, the
horizontal part has to be divided in halves for each channel.
This was done correctly for hactive, but not for the porches.
Of course this does only apply to sn65dsi84, which is also covered
by this driver.
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Markus Bauer <markus.bauer2@xxxxxxxxx>
---
drivers/gpu/drm/bridge/ti-sn65dsi83.c | 16 +++++++++++++---
1 file changed, 13 insertions(+), 3 deletions(-)
diff --git a/drivers/gpu/drm/bridge/ti-sn65dsi83.c b/drivers/gpu/drm/bridge/ti-sn65dsi83.c
index ad73f69d768d..d71f752e79ec 100644
--- a/drivers/gpu/drm/bridge/ti-sn65dsi83.c
+++ b/drivers/gpu/drm/bridge/ti-sn65dsi83.c
@@ -399,7 +399,7 @@ static void sn65dsi83_atomic_pre_enable(struct drm_bridge *bridge,
unsigned int pval;
__le16 le16val;
u16 val;
- int ret;
+ int ret, hfront, hback;
ret = regulator_enable(ctx->vcc);
if (ret) {
@@ -521,12 +521,22 @@ static void sn65dsi83_atomic_pre_enable(struct drm_bridge *bridge,
le16val = cpu_to_le16(mode->vsync_end - mode->vsync_start);
regmap_bulk_write(ctx->regmap, REG_VID_CHA_VSYNC_PULSE_WIDTH_LOW,
&le16val, 2);
+
+ hback = mode->htotal - mode->hsync_end;
+ if (ctx->lvds_dual_link)
+ hback /= 2;
+
regmap_write(ctx->regmap, REG_VID_CHA_HORIZONTAL_BACK_PORCH,
- mode->htotal - mode->hsync_end);
+ hback);
regmap_write(ctx->regmap, REG_VID_CHA_VERTICAL_BACK_PORCH,
mode->vtotal - mode->vsync_end);
+
+ hfront = mode->hsync_start - mode->hdisplay;
+ if (ctx->lvds_dual_link)
+ hfront /= 2;
+
regmap_write(ctx->regmap, REG_VID_CHA_HORIZONTAL_FRONT_PORCH,
- mode->hsync_start - mode->hdisplay);
+ hfront);
regmap_write(ctx->regmap, REG_VID_CHA_VERTICAL_FRONT_PORCH,
mode->vsync_start - mode->vdisplay);
regmap_write(ctx->regmap, REG_VID_CHA_TEST_PATTERN, 0x00);
--
2.34.1
--
Markus Bauer
Avnet Embedded is becoming TRIA:
www.tria-technologies.com
We continuously commit to comply with the applicable data protection laws and ensure fair and transparent processing of your personal data.
Please read our privacy statement including an information notice and data protection policy for detailed information on our website.
